Reporting on TPC QC for LHC22a¶

PilotBeam data from May 2022
Link to JIRA: https://alice.its.cern.ch/jira/browse/O2-3035
B = 0.5 T
beam = pp
energy (sqrt) = 900 GeV
Software version: O2PDPSuite::nightly-20220622-1, jq::v1.6-3
Issues in FT0

Run lists¶

  • 517616: 1656724288512 - 02 Jul 2022 01:11 UTC - 02 Jul 2022 03:11 CEST
  • 517618: 1656711195961 - 01 Jul 2022 21:33 UTC - 01 Jul 2022 23:33 CEST
  • 517619: 1656870807108 - 03 Jul 2022 17:53 UTC - 03 Jul 2022 19:53 CEST
  • 517620: 1656695731655 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 517623: 1656695733057 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 517677: 1656699832878 - 01 Jul 2022 18:23 UTC - 01 Jul 2022 20:23 CEST
  • 517678: 1656695746319 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 517679: 1656870042271 - 03 Jul 2022 17:40 UTC - 03 Jul 2022 19:40 CEST
  • 517684: 1656695744523 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 571685: 1656695748869 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 517689: 1656870074165 - 03 Jul 2022 17:41 UTC - 03 Jul 2022 19:41 CEST
  • 517690: 1656695737619 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 517692: 1656695752300 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 517693: 1656695752367 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 517737: 1656695742026 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 517748: 1656695735131 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 517750: 1656695758958 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 517751: 1656695740371 - 01 Jul 2022 17:15 UTC - 01 Jul 2022 19:15 CEST
  • 517753: 1656694219142 - 01 Jul 2022 16:50 UTC - 01 Jul 2022 18:50 CEST
  • 517758: 1656869840772 - 03 Jul 2022 17:37 UTC - 03 Jul 2022 19:37 CEST
  • 517767: 1656700155260 - 01 Jul 2022 18:29 UTC - 01 Jul 2022 20:29 CEST

General comments¶

  • Potential problems observed in runs 517753 & 517758
    • Higher average momentum => Enhanced high momentum tail in pt distribution
    • Lower number of clusters per track => Looking at the NclustersBeforeCuts it can be seen that tracks with NClusters<60 are much more common
    • Ratio of positive/negative tracks is also different from norm in run 517758

Clusters¶

Variables:

  • N Clusters: c_N_Clusters;1
  • Q Max: c_Q_Max;1
  • Q Tot: c_Q_Tot;1
  • Sigma Time c_Sigma_Time;1
  • Sigma Pad c_Sigma_Pad;1
  • Time Bin c_Time_Bin;1

NClusters (shown is Run 517616)¶

  • Increased noise on OROC3 of C4 and A10.
  • Expected to be related to the powering of the field cage.

QTot (shown is Run 517616)¶

  • Reduced signal on OROC3 of C4 and A10.
  • Expected to be related to the powering of the field cage.

Sigma Time (shown is Run 517616)¶

  • Increased noise on OROC3 of C4 and A10.
  • Expected to be related to the powering of the field cage.

Tracks¶

Observables:

  • h2DQOverPtPhiCside;1 Charger over p_T vs. phi, C side
  • hPhiAsideNeg;1 Azimuthal angle, A side, neg. tracks
  • hPhiCsidePos;1 Azimuthal angle, C side, pos. tracks
  • hPhiCsideNeg;1 Azimuthal angle, C side, neg. tracks
  • h2DNClustersEta;1 Number of clusters vs. eta
  • hEtaRatio;1 Pseudorapidity, ratio neg./pos.
  • hPhiBothSides;1 Azimuthal angle, both sides clusters
  • hPhiAside;1 Azimuthal angle, A side
  • hPhiAsideRatio;1 Azimuthal angle, A side, ratio neg./pos.
  • hPhiCside;1 Azimuthal angle, C side
  • h2DEtaPhi;1 Tracks in eta vs. phi
  • hEtaNeg;1 Pseudorapidity, neg. tracks
  • hNClustersAfterCuts;1 Number of clusters
  • hNClustersBeforeCuts;1 Number of clusters (before cuts)
  • hPhiCsideRatio;1 Azimuthal angle, C side, ratio neg./pos.
  • hEtaPos;1 Pseudorapidity, pos. tracks
  • hPtNeg;1 Transverse momentum, neg. tracks
  • hPtPos;1 Transverse momentum, pos. tracks
  • hEtaBeforeCuts;1 Pseudorapidity (before cuts)
  • hPtBeforeCuts;1 Transverse momentum (before cuts)
  • hPtRatio;1 Transverse momentum, ratio neg./pos.
  • hPt;1 Transverse momentum
  • hQOverPt;1 Charge over transverse momentum
  • h2DQOverPtPhiAside;1 Charger over p_T vs. phi, A side
  • h2DNClustersPhiAside;1 Number of clusters vs. phi, A side
  • hPhiAsidePos;1 Azimuthal angle, A side, pos. tracks
  • h2DEtaPhiBeforeCuts;1 Tracks in eta vs. phi (before cuts)
  • hEta;1 Pseudorapidity
  • h2DNClustersPhiCside;1 Number of clusters vs. phi, C side
  • h2DNClustersPt;1 Number of clusters vs. p_T
  • h2DEtaPhiNeg;1 Negative tracks in eta vs. phi
  • h2DEtaPhiPos;1 Positive tracks in eta vs. phi
  • h2DNClustersEtaBeforeCuts;1 NClusters vs. eta (before cuts)
  • hSign;1 Sign of electric charge
  • h2DNClustersPtBeforeCuts;1 NClusters vs. p_T (before cuts)

Pt distribution¶

  • Potential problems observed in runs 517753 & 517758
    • Higher average momentum

Enhanced high momentum tail in pt distribution for the two problematic runs


Clusters per track¶

  • Potential problems observed in runs 517753 & 517758
    • Lower average count of clusters per track

Shorter tracks more prevelant


Sign¶

  • Slight devation in mean track sign observed in runs 517684 & 517689 & 517758

PID¶

Observables:

  • hdEdxMaxMIPVsSecTPC;1 MIP Q{Max} TPC
  • hdEdxTotMIPVsSecTPC;1 MIP Q{Tot} TPC
  • hdEdxTotMIPVsNclTPC;1 MIP Q{Tot} TPC
  • hdEdxTotMIPVsSnpTPC;1 MIP Q{Tot} TPC
  • hdEdxMaxMIPVsTglTPC;1 MIP Q{Max} TPC
  • hdEdxTotMIPVsTglTPC;1 MIP Q{Tot} TPC
  • hdEdxMaxMIPTPC;1 MIP Q{Max} TPC
  • hdEdxTotMIPTPC;1 MIP Q{Tot} TPC
  • hNClsPID;1 Number of clusters (after cuts)
  • hdEdxTotVsP_NegTPC;1 Q{Tot} negative particles TPC
  • hdEdxMaxMIPVsNclTPC;1 MIP Q{Max} TPC
  • hdEdxMaxMIPVsSnpTPC;1 MIP Q{Max} TPC
  • hNClsSubPID;1 Number of clusters (after cuts)
  • hdEdxVsPhiMipsAside;1 dEdx (a.u.) vs #phi (rad) of MIPs (A side)
  • hdEdxVsTgl;1 dEdx (a.u.) vs tan#lambda
  • hdEdxVsncls;1 dEdx (a.u.) vs ncls
  • hdEdxVsPhi;1 dEdx (a.u.) vs #phi (rad)
  • hdEdxMaxVsPTPC;1 Q{Max} TPC
  • hdEdxTotVspBeforeCuts;1 dEdx (a.u.) vs p (GeV/#it{c}) (before cuts)
  • hdEdxVsPhiMipsCside;1 dEdx (a.u.) vs #phi (rad) of MIPs (C side)
  • hMIPNclVsTglSub_TPC;1 rec. + sub-thrs. clusters TPC
  • hMIPNclVsTgl_TPC;1 rec. clusters TPC
  • hdEdxTotVsP_PosTPC;1 Q{Tot} positive particles TPC
  • hdEdxMaxVspBeforeCuts;1 dEdx_Max (a.u.) vs p (GeV/#it{c}) (before cuts)
  • hdEdxTotVsPTPC;1 Q{Tot} TPC

MIP signal¶

  • No major outliers observed
    • All GOOD

dEdx vs P¶

  • No unexpected shapes observed
  • All GOOD
['GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD', 'GOOD']